[IMPALA-5591] Set statement handling in frontend can't handle negative numbers

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 2.10.0
• Fix Version/s: Impala 2.10.0
• Component/s: Frontend
• Epic Color: ghx-label-3
• Assignee: Tim Armstrong
• Reporter: Tim Armstrong
• Created: 27/Jun/17 23:19
• Updated: 29/Jun/17 16:11
• Resolved: 29/Jun/17 16:11

Description

Reproduction: Include the following code above a query in a .test file:

---- QUERY
set scratch_limit=0;
select ....

The test will fail with an error like:

MainThread: Unexpected exception when executing SET SCRATCH_LIMIT=-1 : ImpalaBeeswaxException:
 INNER EXCEPTION: <class 'beeswaxd.ttypes.BeeswaxException'>
 MESSAGE: AnalysisException: Syntax error in line 1:

The root cause is that the grammar for the set statement doesn't allow a negation.

This doesn't affect impala-shell because it uses a different mechanism for query options.